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我们在使用solr作为索引服务器时，通常会将多个表的多个字段作为联合索引，对多个表快速的数据查询也是solr服务器高效率的体现。这片文章介绍下如何基于多个数据表创建索引。我们使用任意的两个表作为数据源，这两个表可以属于一个数据库，也可以属于不同的数据库，如果使用两个数据库，则需要两个数据源连接字符串，我们这里使用同一个库的两个表作为示例。
两个表结构如下：
表一：
表二：
<dataSource name="jfinal_demo" type="JdbcDataSource" driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://192.168.21.20:3306/jfinal_demo" user="root" password="123456" batchSize="-1" /> <document name="testDoc"> <entity name="user" dataSource="jfinal_demo" pk="id" query="select * from user"> <field column="id" name="userId"/> <span style="white-space:pre"> </span><field column="userName" name="userName"/> <field column="userAge" name="userAge"/> <field column="userAddress" name="userAddress"/> </entity> <entity name="role" pk="id" query="select * from role" > <field column="id" name="roleId"/> <field column="name" name="roleName"/> </entity> </document>
2.1 数据库结构图如下：
2.2 data-config.xml配置如下：
<dataSource type="JdbcDataSource" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://192.168.21.20:3306/jrkj_java" user="root" password="123456" batchSize="-1" />
<document name="testDoc">
<entity name="tj_student" pk="id" query="SELECT id,nickName,isDelete FROM tj_student where isDelete = 0 and applyTeacherState = 1 and isTeacher = 1">
<field column="id" name="id"/>
<field column="nickName" name="nickName"/>
<field column="isDelete" name="isDelete"/>
<entity name="tj_course" pk="id" query="select id,courseName from tj_course where isDelete=0 and courseAuditState=1 and studentId='${tj_student.id}'">
<field column="id" name="courseId"/>
<field column="courseName" name="courseName"/>
</entity>
<entity name="tj_userfield" pk="id" query="select fieldId,studentId from tj_userfield where isDelete = 0 and userFieldType = 1 and studentId = '${tj_student.id}'">
<field column="fieldId" name="fieldId"/>
<field column="studentId" name="studentId"/>
<entity name="tj_field" pk="id" query="select fieldName,pointWord from tj_field where isDelete = 0 and id='${tj_userfield.fieldId}'">
<field column="fieldName" name="fieldName"/>
<field column="pointWord" name="pointWord"/>
</entity>
</entity>
<entity name="tj_userIndustry" pk="id" query="select industryId from tj_userindustry where isDelete = 0 and userIndustryType = 1 and studentId = '${tj_student.id}'">
<field column="industryId"/>
<entity name="tj_industry" pk="id" query="select industryName from tj_industry where isDelete = 0 and id = '${tj_userIndustry.industryId}'">
<field column="industryName" name="industryName"/>
</entity>
</entity>
</entity>
</document>除了上面这种形式，官网给了第二种方式，结构如下：
<dataSource type="JdbcDataSource" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://192.168.21.20:3306/jrkj_java" user="root" password="123456" batchSize="-1" />
<document name="testDoc">
<entity name="tj_student" pk="id" query="SELECT id,nickName,isDelete FROM tj_student where isDelete = 0 and applyTeacherState = 1 and isTeacher = 1">
<entity name="tj_course" pk="id" query="select id,courseName from tj_course where isDelete=0 and courseAuditState=1 and studentId='${tj_student.id}'">
</entity>
<entity name="tj_userfield" pk="id" query="select fieldId,studentId from tj_userfield where isDelete = 0 and userFieldType = 1 and studentId = '${tj_student.id}'">
<entity name="tj_field" pk="id" query="select fieldName,pointWord from tj_field where isDelete = 0 and id='${tj_userfield.fieldId}'">
</entity>
</entity>
<entity name="tj_userIndustry" pk="id" query="select industryId from tj_userindustry where isDelete = 0 and userIndustryType = 1 and studentId = '${tj_student.id}'">
<entity name="tj_industry" pk="id" query="select industryName from tj_industry where isDelete = 0 and id = '${tj_userIndustry.industryId}'">
</entity>
</entity>
</entity>
</document>
2.3 配置schema.xml配置如下：
2.4 重启solr服务，测试。
三 总结
多表索引是solr服务器最常见的索引方式，因为索引关键字很容易重复，特别是主键容易出错，所以创建索引时需要非常小心。
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原文地址：http://blog.csdn.net/u010942465/article/details/51339970
